add some stderr output to reference stress tests

upskirtref_test.go

@@ -14,7 +14,9 @@
 package blackfriday
 
 import (
+	"fmt"
 	"io/ioutil"
+	"os"
 	"path/filepath"
 	"testing"
 )
@@ -50,18 +52,21 @@ func doTestsReference(t *testing.T, files []string, flag int) {
 		}
 		expected := string(expectedBytes)
 
+		fmt.Fprintf(os.Stderr, "processing %s ...", filename)
 		actual := string(runMarkdownReference(input, flag))
 		if actual != expected {
 			t.Errorf("\n    [%#v]\nExpected[%#v]\nActual  [%#v]",
 				basename+".text", expected, actual)
 		}
+		fmt.Fprintf(os.Stderr, " ok\n")
 
 		// now test every prefix of every input to check for
 		// bounds checking
 		if !testing.Short() {
-			start := 0
-			for end := start + 1; end <= len(input); end++ {
+			start, max := 0, len(input)
+			for end := start + 1; end <= max; end++ {
 				candidate = input[start:end]
+				fmt.Fprintf(os.Stderr, "  %s %d:%d/%d\n", filename, start, end, max)
 				_ = runMarkdownReference(candidate, flag)
 			}
 		}